objective-c - objective-c 类和 swift 类之间的 NSNotification

Question

我的项目同时包含 objective-c 类和 swift 类。现在我需要从 Objective-C 类发布通知:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // Here I present swift view controller
    CollectionViewController *cvc = [[CollectionViewController alloc] initWithNibName:@"CollectionViewController" bundle:nil];
    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:cvc];
    [self.navigationController presentViewController:controller animated:YES completion:nil];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"BuildingReady" object:self userInfo:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:chosenBuilding, nil] forKeys:[NSArray arrayWithObjects:@"chosenBuilding", nil]]];
}

我正在 swift 类中收听此通知:

import UIKit

@objc class CollectionViewController : UIViewController, UICollectionViewDataSource, UICollectionViewDelegate , UICollectionViewDelegateFlowLayout {

   override func viewDidLoad() {
      super.viewDidLoad()

      NSNotificationCenter.defaultCenter().addObserver(self, selector: "getBuilding:", name: "BuildingReady", object: nil)
   }

   func getBuilding(notification: NSNotification) {
        let userInfo: Dictionary<String, Building!> = notification.userInfo as! Dictionary<String, Building!>

        self.chosenBuilding = userInfo["chosenBuilding"]
   }

问题是在 swift 类中我从来没有收到通知(func getBuilding 从未被调用)。 一个对象是 objective-c 类而第二个对象是 swift 类会不会有问题？

Answer 1

尝试这样的事情:

dispatch_async(dispatch_get_main_queue(), ^{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"BuildingReady" object:self userInfo:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:choosedBuilding, nil] forKeys:[NSArray arrayWithObjects:@"choosedBuilding", nil]]];
});